Thread tension device



G. HORN Aug. 28, 1934.

THREAD TENSION DEVICE Filed Sept. 6. 1933 Patented Aug. 28, 1934 UNITEDTENSION DEVICE Guido Horn, Berlin-W Bobbin brakes and thread deliverydevices for braiding machines and other purposes are known in which thebobbin is kept under braking force by a special brake mechanism thebraking action 5 of which is reduced in accordance with the threadconsumption by means of a thread tension lever actuated by the pull atthe thread.

According to the present invention no particular self-acting brakedevice (or the bobbin is pro- 19 vided. The braking action is, moreover,obtained by passing the thread, coming from the bobbin, over a brakelever in such a way that by a pull at said lever the bobbin brake isapplied. The release of the brake is obtained by leading the 1 threadover a particular thread tension lever which yields according to thepull on the thread, so that, in consequence to the alteration of thethread path, the pulling action of the thread upon the bobbin brakelever is reduced until the w bobbin is allowed torotate and to deliverthread.

In the following description the generalterm "thread" is intended toinclude wires, cords, cables or the like also.

In the accompanying drawing the invention is 2 shown by way of example.

i lgure l is a front elevation and Figure 2 is a top plan view.

Fixed to the plate a of the bobbin carrier is a pin it upon which abrake disk provided with a so long sleeve h is pivoted. 'I'he bobbind iscarried by the sleeve h of the brake disk c. A brake lever f and athread tension lever a are pivotally arranged upon a short vertical bolt8. By means of a spring is the tension thread lever a is turned in theposition shown in dotted lines in Figure 2. This turning movement islimited by a. stop 1 shown in Fig. 2. On exerting a pull on the thread ia brake shoe 1' provided at the shorter arm of the double armed brakelever is pressed against ,0 the brake disk c, so that rotation of thebobbin 0! is prevented which is sumciently fixed to the sleeve h of thedisk 0. With progressive consumption 0! thread the thread tension levera is brought into the position shown in full lines in 5 Fig. 2. It willbe seen from Fig. 2 that the pressure of the thread i against the brakelever f is reduced by the above mentioned movement of the lever g. Thebrake disk 0 with its bobbin d now rotates in accordance with thereduction 0! the braking pressure; should it happen that more thread isdelivered than necessary, the pulling action of the tread i upon thebrake lever I is increased again, whereby the braking force acting uponthe bobbin also is increased again. i The tension applied to the threadi by the bobbin brake depends on the tension of the spring k acting onthe thread tension lever g. Ii this spring is is heavily tensioned, thepressure 01' the thread 1' against the brake lever f is increased andtherefore the braking force also is increased accordingly.

In the example shown, the brake lever and the thread tension lever g arearranged one above the other and rotatably around the same bolt 0. Ofcourse, the hub of the brake lever l may be made longer to afiord abetter bearing and the thread tension lever g may be pivotally arrangedupon the hub of the brake lever. Furthermore, the shoe f of the brakelever I may be substituted by any other braking member. The pivotcentres of the two levers j and a may also be spaced from each other.The spring is acting on the thread tension lever g is, of course,adjustable or exchangeable. The construction with levers having onebearing only is principally adapted tor light thread tension, or shortbobbins respectively. In case of heavy strains both ends of the leversmay be journalled. Besides, the brake lever and the thread tension levermay be arranged separated from the bob- 8o bin in such a manner, thatthe thread on its way to the thread tension lever passes over suitableguiding elements. I! under such conditions the brake lever is suitablyshaped its short arm may still act upon the brake disk, or suitable astransmitting gears must be provided.

what I claim is:

1. In a thread tension device in combination a bobbin carrier plate, apin fixed to said plate,

a brake disk pivoted to said pin and provided with a sleeve surroundingsaid pin, a double armed brake lever freely rotatable upon said bobbincarrier plate, an eye carrying the thread provided at the longer arm ofsaid brake lever,

a brake shoe arranged at the shorter arm of said brake lever, a threadtension lever pivotally arranged upon said bobbin carrier plate, aspring acting upon said thread tension lever and urging same in adirection away from said brake lever and a stop fixed to said bobbincarrier plate for limiting the movement of said thread tension leverunder the action of said spring, the arrangement being such, that a pullon the thread causes movement of said thread tension lever against theaction of said spring towards said brake lever, resulting in changingthe direction 01' the thread pull on said brake lever and in lesseningthe braking action.

2. In a thread tension device in combination a bobbin carrier plate, apin fixed to said plate,

brake lever and a stop fixed to said bobbin carrier plate for limitingthe movement 0! said thread tension lever under'the action of saidspring, the arrangement being such. that a pull on the thread causesmovement 0! said thread tension lever against the action of said springtowards said brake lever, resulting in changing the direction of thethread pull on said brake lever and in lessening the braking action.

GUIDO HORN.

